Billionaire Sergey Brin is building political infrastructure that will last beyond his $102 million fight against Prop 40 | Fortune

Google cofounder Sergey Brin has built a lasting political operation through his Building a Better California committee, which is waging a $102 million campaign against California's Prop 40, a ballot measure that would raise taxes on high earners. The effort, detailed in a Fortune report published November 2, 2026, marks one of the largest single-donor political expenditures in California history and signals Brin's shift from episodic donations to durable political infrastructure. The committee's scale gives Brin influence over state tax policy that could affect high-income residents and businesses, including tech executives and firms with California exposure. Watch whether Prop 40 passes or fails and how Brin's committee deploys its remaining funds in future state races and tax fights.